package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    DishMapper dishMapper;
    @Autowired
    SetmealMapper setmealMapper;

    /**
     * 添加购物车
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList != null && shoppingCartList.size() != 0) {
            if (shoppingCartList.size() == 1) {
                shoppingCart = shoppingCartList.get(0);
                shoppingCart.setNumber(shoppingCart.getNumber() + 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            } else {
                throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_ADD_FAILED);
            }
        } else {
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId == null) {
                Long setmealId = shoppingCartDTO.getSetmealId();
                if (setmealId != null) {
                    Setmeal setmeal = setmealMapper.getById(setmealId);
                    shoppingCart.setName(setmeal.getName());
                    shoppingCart.setImage(setmeal.getImage());
                    shoppingCart.setAmount(setmeal.getPrice());
                } else {
                    throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_ADD_FAILED);
                }
            } else {
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 浏览购物车
     */
    @Override
    public List<ShoppingCart> listShoppingCart() {
        return shoppingCartMapper.list(
                ShoppingCart.builder()
                        .userId(BaseContext.getCurrentId())
                        .build());
    }

    /**
     * 清空购物车商品
     */
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车中一个商品
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList != null && shoppingCartList.size() > 0) {
            if (shoppingCartList.size() == 1) {
                shoppingCart = shoppingCartList.get(0);
                Integer number = shoppingCart.getNumber();
                if(number==1){
                    shoppingCartMapper.deleteById(shoppingCart);
                }else {
                    shoppingCart.setNumber(number-1);
                    shoppingCartMapper.updateNumberById(shoppingCart);
                }
            } else {
                throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_DELETE_FAILED);
            }
        } else {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_DELETE_FAILED);
        }
    }
}
